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Compositing refers to the process of combining visual elements from separate sources into a single image, often to create the illusion that all those elements are part of the same scene. This technique is fundamental in visual effects (VFX), animation, and digital art. The core idea is to layer different visual components, such as live-action footage, computer-generated imagery (CGI), matte paintings, or even elements from different photographs, and blend them seamlessly.

Key to compositing is the manipulation of transparency and color information. Alpha channels, which define the transparency of a layer, are crucial for determining how overlapping elements interact. Techniques like keying (often green screen or blue screen) are used to isolate specific objects or characters from their backgrounds, allowing them to be placed into new environments. Color correction and grading are also essential to ensure that all combined elements match in terms of lighting, color temperature, and overall mood, making the final composite appear cohesive and believable.

Modern compositing is typically performed using specialized software that allows artists to manipulate multiple layers, apply various effects, and control the blending modes between them. The goal is to create a final image or sequence that is indistinguishable from reality or achieves a desired artistic effect. This can range from simple photo retouching to the complex integration of fantastical creatures into live-action films.